This week’s case is a 6 month old female neutered Labrador Retriever who is small for her age and has trouble seeing. Post your interpretations in the comments section.
FindingsIn both forelibms, there is cranial bowing to the distal radius with irregularity of the distal ulnar physis. There is severe incongruity of the humeroulnar and humeroradial joints. There is remodeling of the proximal aspect of the anconeal process and mild subluxation of the proximal aspect of the radius. Carpal valgus is also present.
DiagnosisOcular and skeletal dysplasia (aka ocular chondrodysplasia) of Labrador Retrievers.
DiscussionThis syndrome is caused by a gene that has effects on both the skeleton and the eye. This dog had cataracts and retinal detachment at the time the radiographs were taken. The bones of the appendicular skeleton are shortened, and the joints, especially the elbow and hip, are abnormal. The radius is usually curved and the distal metaphyses of the radius and ulna are widened. Published reference ranges for diagnosing this condition are radial length of less than 3 cm and ulnar less than 3.7 cm at 16 days of age. The shape of the humerus is also different between affected and unaffected dogs.
- Carrig CB, Schmidt GM, Tvedten HW. Growth of the radius and ulna in Labrador Retriever dogs with ocular and skeletal dysplasia. Veterinary Radiology 1990;31:165-168.